Trouble with fourth gear |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Trouble with fourth gear |
Darksude |
May 8 2018, 08:34 PM
Post
#1
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
I own an old 1975 Porsche 914 and we recently got the car up and running. One issue we are having trouble getting it into fourth gear. We don’t know if it may be the linkage or if it’s something more complex.
|
jcd914 |
May 9 2018, 12:09 AM
Post
#2
|
Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
Look at your linkage first.
Check the tapered set screws at the coupling just past the firewall and at the trans shift console. And check all the plastic bushing in the linkage. The set screws work loose and the plastic bushings deteriorate. Jim |
Dave_Darling |
May 9 2018, 12:37 AM
Post
#3
|
914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Always check the linkage first; it's easy and can cause issues. Also look into the center tunnel (carpet off) to see if any of the cables in the center tunnel shift from side to side when you push the clutch. The tube that the clutch cable goes through in the center tunnel can break loose, and that can sometimes interfere with the shifter in the 4/5 plane.
Unfortunately, it is often the case that problems with one single gear is in the transmission itself, and some disassembly will be required to fix. --DD |
Darksude |
May 9 2018, 06:11 PM
Post
#4
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
|
jcd914 |
May 9 2018, 06:43 PM
Post
#5
|
Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
I don’t know if this changes any of the answers but it’d hitting something physical. We can’t really tell what it’s hitting though. We also don’t know if that spring block is the case There is almost no chance this issue you have is in the tunnel or at the shift lever. It is possible the clamp you see in your picture has come loose and the rod is not moving directly with the shift lever. There is a bushing between the shift lever and shift rod but it almost never (in my experience) fails. You can unbolt the shifter housing from the tunnel and lift it a little and look in case there is something loose in the tunnel that is blocking the shifter but it is not likely. The for and aft movement of the shifter is limited by the shift lever on the transmission. When it reaches the end of it's range of motion it stops the shift rod which in turn stops the shift lever. If bushings in the shift linkage have failed then the shifter and shift rod and transmission shift lever do not move in sync. You need to be looking at the linkage under the car from the firewall back. Jim |
Gint |
May 9 2018, 06:48 PM
Post
#6
|
Mike Ginter Group: Admin Posts: 16,093 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
Trashed shift coupler bushings will do exactly that, make it tough (impossible) to find 4th gear. In my expereince anyway... As others have said, check all the linkage and associated bushings. There is as good a chance as any that you'll find the issue right away.
|
Darksude |
May 9 2018, 06:53 PM
Post
#7
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
I don’t know if this changes any of the answers but it’d hitting something physical. We can’t really tell what it’s hitting though. We also don’t know if that spring block is the case There is almost no chance this issue you have is in the tunnel or at the shift lever. It is possible the clamp you see in your picture has come loose and the rod is not moving directly with the shift lever. There is a bushing between the shift lever and shift rod but it almost never (in my experience) fails. You can unbolt the shifter housing from the tunnel and lift it a little and look in case there is something loose in the tunnel that is blocking the shifter but it is not likely. The for and aft movement of the shifter is limited by the shift lever on the transmission. When it reaches the end of it's range of motion it stops the shift rod which in turn stops the shift lever. If bushings in the shift linkage have failed then the shifter and shift rod and transmission shift lever do not move in sync. You need to be looking at the linkage under the car from the firewall back. Jim Thank you! I will look at that immediately and see if something is blocking it or loose. |
Darksude |
May 9 2018, 06:54 PM
Post
#8
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
|
Darksude |
May 9 2018, 06:54 PM
Post
#9
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
Always check the linkage first; it's easy and can cause issues. Also look into the center tunnel (carpet off) to see if any of the cables in the center tunnel shift from side to side when you push the clutch. The tube that the clutch cable goes through in the center tunnel can break loose, and that can sometimes interfere with the shifter in the 4/5 plane. Unfortunately, it is often the case that problems with one single gear is in the transmission itself, and some disassembly will be required to fix. --DD Thanks! I’ll look at it see what I find |
Darksude |
May 10 2018, 09:17 AM
Post
#10
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
Trashed shift coupler bushings will do exactly that, make it tough (impossible) to find 4th gear. In my expereince anyway... As others have said, check all the linkage and associated bushings. There is as good a chance as any that you'll find the issue right away. Thanks for the advice! I’m lifting the car today and we’re gonna get a look under it and see what’s the issue |
Dr Evil |
May 10 2018, 12:16 PM
Post
#11
|
Send me your transmission! Group: Members Posts: 23,032 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Click my link in my sig below for my notes. It will help you diagnose your issue and also see about helping prevent others. I 100% agree with the above, tho.
|
dr914@autoatlanta.com |
May 10 2018, 01:05 PM
Post
#12
|
914 Guru Group: Members Posts: 8,056 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
could be hitting a broken clutch tube, as the bracket that holds it against the left side of the tunnel breaks, moves the clutch tube over and then when shifting into fourth and fifth, the bottom of the shifter hits the tube.
Hold the shifter toward fourth fifth, and then push in and let out the pedal and see if you feel that action through the shifter |
porschetub |
May 10 2018, 05:31 PM
Post
#13
|
Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
[quote name='Dave_Darling'
Unfortunately, it is often the case that problems with one single gear is in the transmission itself, and some disassembly will be required to fix. --DD [/quote] (IMG:style_emoticons/default/agree.gif) my experience (somewhat bitter) is that if one or more gears aren't working its generally adjustment or bushes,when this is right only one gear not going in or staying in its inside the box....my issue (IMG:style_emoticons/default/sad.gif) . Mine ever so gently pops of of forth,no fuss no noise,everthing has been checked,checked again and updated where it can be,all other gears are fine. |
Darksude |
May 10 2018, 05:47 PM
Post
#14
|
Newbie Group: Members Posts: 13 Joined: 8-May 18 From: Tehachapi Member No.: 22,104 Region Association: Central California |
We weren’t able to lift it today but we figured out it needs to be adjusted.
|
barefoot |
Aug 5 2018, 12:54 PM
Post
#15
|
Senior Member Group: Members Posts: 1,319 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States |
could be hitting a broken clutch tube, as the bracket that holds it against the left side of the tunnel breaks, moves the clutch tube over and then when shifting into fourth and fifth, the bottom of the shifter hits the tube. Hold the shifter toward fourth fifth, and then push in and let out the pedal and see if you feel that action through the shifter Like this ?? Mine was off to the wrong side of the shift linkage !! |
Lo-Fi Version | Time is now: 28th September 2024 - 11:07 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |